I Broke through and used an old flexible bread knife behind it. It was bonded to polystyrene but no problem and cheap to replace. Staples are used in the main timber frame and I used a bolster chisel in these areas to ease it off.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets